[Templates] creating lists

[Dave Howorth]

I want to collect several lists of numbers from a loop. The type of 
statements I have in mind to do this go something like:

  listname = 'an_actual_listname' ;
  a_number = 42 ;
  my_hash.$listname.push(a_number)
This doesn't work unless I prime the lists outside the loop with 
statements like:

  my_hash.an_actual_listname = [ ]
I'd like to avoid that if I can, so that I can use the existence or not 
of the hash keys as an indication of whether any of that class of 
numbers occurred, instead of iterating checking list sizes.

Is there a neat way to do this?
Thanks, Dave
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